<template>
  <div class="cropper-content">
    <div class="cropper-box">
      <div class="cropper">
        <vue-cropper
          ref="cropper"
          :img="option.img"
          :output-size="option.outputSize"
          :output-type="option.outputType"
          :info="option.info"
          :can-scale="option.canScale"
          :auto-crop="option.autoCrop"
          :auto-crop-width="autoCropWidth"
          :auto-crop-height="autoCropHeight"
          :fixed="option.fixed"
          :fixed-number="fixedNumber"
          :full="option.full"
          :fixed-box="option.fixedBox"
          :can-move="option.canMove"
          :can-move-box="option.canMoveBox"
          :original="option.original"
          :center-box="option.centerBox"
          :height="option.height"
          :info-true="option.infoTrue"
          :max-img-size="option.maxImgSize"
          :enlarge="option.enlarge"
          :mode="option.mode"
          @realTime="realTime"
          @imgLoad="imgLoad"
        />
      </div>
      <!--底部操作工具按钮-->
      <div class="footer-btn">
        <div class="scope-btn">
          <label class="btn" for="uploads">选择封面</label>
          <input id="uploads" type="file" style="position:absolute; clip:rect(0 0 0 0);" accept="image/png, image/jpeg, image/gif, image/jpg" @change="selectImg($event)">
          <el-button size="mini" type="danger" plain icon="el-icon-zoom-in" @click="changeScale(1)">放大</el-button>
          <el-button size="mini" type="danger" plain icon="el-icon-zoom-out" @click="changeScale(-1)">缩小</el-button>
          <el-button size="mini" type="danger" plain @click="rotateLeft">↺ 左旋转</el-button>
          <el-button size="mini" type="danger" plain @click="rotateRight">↻ 右旋转</el-button>
        </div>
        <div class="upload-btn">
          <el-button size="mini" type="success" @click="uploadImg('blob')">上传封面 <i class="el-icon-upload" /></el-button>
        </div>
      </div>
    </div>
    <!--预览效果图-->
    <div class="show-preview">
      <div :style="previews.div" class="preview">
        <img :src="previews.url" :style="previews.img">
      </div>
    </div>
  </div>
</template>

<script>
import { VueCropper } from 'vue-cropper';
import { getToken } from '@/utils/auth';
import axios from 'axios';
export default {
  name: 'CropperImage',
  components: {
    VueCropper
  },
  props: {
    name: {
      type: String,
      default: 'uploadImgSuccess'
    },
    fixedNumber: {
      type: Array,
      default: Object => [1, 1]
    },
    autoCropWidth: {
      type: Number,
      default: 230
    },
    autoCropHeight: {
      type: Number,
      default: 230
    }
  },
  data() {
    return {
      baseURL: process.env.NODE_ENV === 'production' ? process.env.VUE_APP_BASE_API : '/',
      previews: {},
      option: {
        img: '', // 裁剪图片的地址
        outputSize: 1, // 裁剪生成图片的质量(可选0.1 - 1)
        outputType: 'jpeg', // 裁剪生成图片的格式（jpeg || png || webp）
        info: true, // 图片大小信息
        canScale: true, // 图片是否允许滚轮缩放
        autoCrop: true, // 是否默认生成截图框
        fixed: true, // 是否开启截图框宽高固定比例
        full: true, // false按原比例裁切图片，不失真
        fixedBox: false, // 固定截图框大小，不允许改变
        canMove: false, // 上传图片是否可以移动
        canMoveBox: true, // 截图框能否拖动
        original: true, // 上传图片按照原始比例渲染
        centerBox: true, // 截图框是否被限制在图片里面
        height: true, // 是否按照设备的dpr 输出等比例图片
        infoTrue: false, // true为展示真实输出图片宽高，false展示看到的截图框宽高
        maxImgSize: 3000, // 限制图片最大宽度和高度
        enlarge: 1, // 图片根据截图框输出比例倍数
        mode: 'contain' // 图片默认渲染方式
      }
    };
  },
  methods: {
    // 初始化函数
    imgLoad(msg) {
      console.log('工具初始化函数=====' + msg);
    },
    // 图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    // 向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    // 向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    // 实时预览函数
    realTime(data) {
      this.previews = data;
    },
    // 选择图片
    selectImg(e) {
      const file = e.target.files[0];
      if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
        this.$message({
          message: '图片类型要求：jpeg、jpg、png',
          type: 'error'
        });
        return false;
      }
      // 转化为blob
      const reader = new FileReader();
      reader.onload = (e) => {
        let data;
        if (typeof e.target.result === 'object') {
          data = window.URL.createObjectURL(new Blob([e.target.result]));
        } else {
          data = e.target.result;
        }
        this.option.img = data;
      };
      // 转化为base64
      reader.readAsDataURL(file);
    },
    // 上传图片
    uploadImg(type) {
      const _this = this;
      if (type === 'blob') {
        // 获取截图的blob数据
        this.$refs.cropper.getCropBlob(async(data) => {
          const formData = new FormData();
          const fileName = new Date().getTime() + '.jpg';
          formData.append('file', data, fileName);
          // 调用axios上传
          const config = {
            headers: {
              'Content-Type': 'multipart/form-data',
              'APEXEDU': getToken()
            }
          };
          await axios.post(_this.baseURL + 'rest/api/upload/sfile', formData, config).then((res) => {
            const { data } = res;
            if (undefined !== data && data !== null) {
              _this.$message({
                message: '保存成功',
                type: 'success'
              });
              const imgInfo = {
                name: data.name,
                url: data.url
              };
              _this.$emit('uploadImgSuccess', imgInfo);
              Object.assign(_this.$data.option, _this.$options.data.call(this).option);
            } else {
              _this.$message({
                message: '文件服务异常，请联系管理员！',
                type: 'error'
              });
            }
          }).catch(() => {
            _this.$message({
              message: '文件服务异常，请联系管理员！',
              type: 'error'
            });
          });
        });
      }
    }
  }
};
</script>

<style scoped lang="scss">
.cropper-content{
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .cropper-box{
    flex: 1;
    width: 100%;
    .cropper{
      width: auto;
      height: 300px;
    }
  }

  .show-preview{
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
    .preview{
      overflow: hidden;
      border:1px solid #67c23a;
      background: #cccccc;
    }
  }
}
.footer-btn{
  margin-top: 30px;
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .scope-btn{
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    padding-right: 10px;
  }
  .upload-btn{
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
  }
  .btn {
    outline: none;
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    -webkit-appearance: none;
    text-align: center;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    outline: 0;
    -webkit-transition: .1s;
    transition: .1s;
    font-weight: 500;
    padding: 8px 15px;
    font-size: 12px;
    border-radius: 3px;
    color: #fff;
    background-color: #409EFF;
    border-color: #409EFF;
    margin-right: 10px;
  }
}
</style>
